Enable 'sleep' function in Windows environment where this does not exist, although not exact in time. (there is a delay for each ping) This is a simple way to separate commands with a time-period.
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Character: "?" is the Byte Order Mark (BOM) of the Unicode Standard.
Specifically it is the hex bytes EF BB BF, which form the UTF-8 representation of the BOM,
misinterpreted as ISO 8859/1 text instead of UTF-8.
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This does the same thing as many of the 'grep' based alternatives but allows a more finite control over the output. For example if you only wanted the process ID you could change the command:
ps -ef | awk '/mingetty/ && !/awk/ {print $2}'
If you wanted to kill the returned PID's:
ps -ef | awk '/mingetty/ && !/awk/ {print $2}' | xargs -i kill {}Show Sample Output

Allows you to connect to an SMTP server over TLS, which is useful for debugging SMTP sessions. (Much like telnet to 25/tcp). Once connected you can manually issue SMTP commands in the clear (e.g. EHLO)
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I don't truly enjoy many commands more than this one, which I alias to be ps1.. Cool to be able to see the heirarchy and makes it clearer what need to be killed, and whats really going on.
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Only shows files with actual changes to text (excluding whitespace). Useful if you've messed up permissions or transferred in files from windows or something like that, so that you can get a list of changed files, and clean up the rest.

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